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New implementation method for case conversion.

This commit is contained in:
Guido van Rossum 1992-01-14 18:31:29 +00:00
parent 49d6dc4123
commit a61ff7b160
2 changed files with 16 additions and 20 deletions
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18
Lib/string.py
View File

@ -12,34 +12,32 @@ hexdigits = digits + 'abcdef' + 'ABCDEF'
octdigits = '01234567'
# Case conversion helpers
_caseswap = {}
for i in range(26):
_caseswap[lowercase[i]] = uppercase[i]
_caseswap[uppercase[i]] = lowercase[i]
_idmap = ''
for i in range(256): _idmap = _idmap + chr(i)
_lower = _idmap[:ord('A')] + lowercase + _idmap[ord('Z')+1:]
_upper = _idmap[:ord('a')] + uppercase + _idmap[ord('z')+1:]
_swapcase = _upper[:ord('A')] + lowercase + _upper[ord('Z')+1:]
del i
# convert UPPER CASE letters to lower case
def lower(s):
res = ''
for c in s:
if 'A' <= c <= 'Z': c = _caseswap[c]
res = res + c
res = res + _lower[ord(c)]
return res
# Convert lower case letters to UPPER CASE
def upper(s):
res = ''
for c in s:
if 'a' <= c <= 'z': c = _caseswap[c]
res = res + c
res = res + _upper[ord(c)]
return res
# Swap lower case letters and UPPER CASE
def swapcase(s):
res = ''
for c in s:
if 'a' <= c <= 'z' or 'A' <= c <= 'Z': c = _caseswap[c]
res = res + c
res = res + _swapcase[ord(c)]
return res
# Strip leading and trailing tabs and spaces

18
Lib/stringold.py
View File

@ -12,34 +12,32 @@ hexdigits = digits + 'abcdef' + 'ABCDEF'
octdigits = '01234567'
# Case conversion helpers
_caseswap = {}
for i in range(26):
_caseswap[lowercase[i]] = uppercase[i]
_caseswap[uppercase[i]] = lowercase[i]
_idmap = ''
for i in range(256): _idmap = _idmap + chr(i)
_lower = _idmap[:ord('A')] + lowercase + _idmap[ord('Z')+1:]
_upper = _idmap[:ord('a')] + uppercase + _idmap[ord('z')+1:]
_swapcase = _upper[:ord('A')] + lowercase + _upper[ord('Z')+1:]
del i
# convert UPPER CASE letters to lower case
def lower(s):
res = ''
for c in s:
if 'A' <= c <= 'Z': c = _caseswap[c]
res = res + c
res = res + _lower[ord(c)]
return res
# Convert lower case letters to UPPER CASE
def upper(s):
res = ''
for c in s:
if 'a' <= c <= 'z': c = _caseswap[c]
res = res + c
res = res + _upper[ord(c)]
return res
# Swap lower case letters and UPPER CASE
def swapcase(s):
res = ''
for c in s:
if 'a' <= c <= 'z' or 'A' <= c <= 'Z': c = _caseswap[c]
res = res + c
res = res + _swapcase[ord(c)]
return res
# Strip leading and trailing tabs and spaces